I can assure you the world's largest fast food chain, in existence since 1940 that has annual revenues of $27.5 billion has spent a massive amount of time and money analyzing and refining the prices for every product.
I can't back it up, but I'd wager they've spent many tens of millions doing exactly that.
(I worked at a telco that was spending an ungodly percentage of revenue doing just that)
yes i don't deny that they probably spent a lot of time and money on this, as you said
what i'm saying is, they probably still ended up using A/B testing to experiment and verify the truth, and used that to make the decision
sure, they could have had analysts that wrote reports on every "could be" scenario (of which 10-is-same-price-as-20 is one). But i'd say those analysis or theories had very little or even nothing to do with why ncnuggets are priced this way.
I can't back it up, but I'd wager they've spent many tens of millions doing exactly that.
(I worked at a telco that was spending an ungodly percentage of revenue doing just that)